Telephone and telegraph relay or repeater.



J. H. GUNTZ. TELEPHONE AND TELEGRAPH RELAY 0R REPEATER. APPLICATION FILED PERM, 1903.

1,038,301 Patented Sept. 10, 1912.

v To all wbom it may JOHN H. CUNTZ, OF HOBOKEN, NEW JERSEY.-

Specification of Letters Patent.

rnnnrnonn AND TELEGRAPH nnmr on. nnrnarnn.

Patented Sept. 1c, 1912.

- "Application filed February 19, 1903. Serial No. 34,134.

-Be it known that I,.Jom-r H. CUNTZ, a

citizen of the UnitedStates, and resident of Hoboken, in the county of Hudson and State of New Jersey, (whose post-office address is No. 325 Hudson Street, Hoboken, New J ersey,) have invented certain new and useful Improvements in Telephone and Tele ph Relays or Repeaters, of which the ollowing is a specification, reference being had to the accompanying drawings, forming apart hereof; v This invention relates to'means for relay- I ing or repeating telephone and telegraph messages. a

Telephone repeating coils have been used in which there are two windings, a' primary and a secondary, variations in the current from the two former and in circuit with an independent source of current. In one form of this relay the coils are wound around an iron core, and a continuous current is passed through the third, orauxiliary. coil, of such a strength that the magnetic field due to'it will cause the iron of the core to be at, or about, the ploint of maximum permeability. It is we known that the rmeability of iron varies with the strenft of the magnetic field in which it is place At low magnetizations, such as are caused by telephonic and submarine-telegraphic currents, the permeability is comparatively low.

. It (the permeability) increases with increas-.

ing m netizationu to a point where the strengt of the fiel' is about from 1 to 10 C. G. S. units 'varying, of. course, with different kinds of iron. After passing this point, the permeability again decreases. The iron when at and near the maximum permeability point is in a state where small variations in the current of the, primary Icoil will cause comparatively great changes to occur in the iron of the core, and, hence, in the induced currents of the secondary coil- The variations of the current 1n the secondary coil and in the line circuit to which it is connected, will then be equal to those of the primary coil in number, and similar in form, but will have a greater amplitude or intensity, and thus the message will be carried on with increased strength.

When an alternating current is passed through the auxiliary coil, the magnetic particles of the core will be kept in continual motion, and will then be in a particula'rly sensitive condition, so that any variations in the primary current will cause comparatijely great changes in the magnetic state of the core, which changes will induce correspondii'ig'variations in the current of the secondary coil, and of the line Y circuit to which it is connected; For tele phone purposes this alternating current should be of a frequency below the limit of audibility, and should have a smooth wave v form, without angles or sudden changes and breaks which would cause sounds in the telephones. And whenever the alternating current is used for the purposes here indicated,

it should preferably have a very low fre-- quency, just great enough to keep the magnftic particles of the iron in motion, and not 5 ;high as to cause any deleterious effects. This slowly alternating current" in the auxiliary coil will, of course, induce corresponding currents in the primary and jsccondary coils and hence in the line wires butthese currents will not produaa hugtfu-l efiects if the frequency is low enough. There will be on the line an alternating current having a very long period and smooth ,wave form, on which will be superposed the telephonic and telegraphic currents like little ripples on an ocean ground swelliras indicated in Fig. 4.

For some purposes I prefer to have the alternating current of a mean; strength" such as will producea magnetic field which causes the average state of the iron to be at or near that of maximum permeability.

In certain cases it is advantageous for the iron core to form a closed magnetic circuit, and I then make my iron core in the shape of a. ring or in some other suitable form. The core is composed preferably of fine wires of iron possessing high permeability and a low hysteresis coefiicienh- Besides being of service in telephone work, my relay or repeater is adapted to telegraph workgand, partic 'ularly,'- to submarine; telegraphy, wherei -the currents are very feeble. i

My relay or repeater will'transmit messages in either direction equallywell, .and the' primary coil can act as a secondary coil andv the.secondary coil as a primary, with equal facilit The names primary and secondary are used in these specifications for the sake of clearness. In the accompanying drawings, Figure 1 represents a'relay or repeater with a ringshaped'iron core, about which are wound a primary coil, connected to 'the incoming line wires, a secondary coil, connected to the outgoing line 'wires,-and an auxiliary coil connected to an independent source of alternating current. Fig. 2 represents a relay or repeaterlwith a straightiron core, the g primary, secondary and auxiliary coils be. ingconnected-as in Flg. l, the auxlhary coil, as shown, being in circuit with an independent-"source of alternating current.

. tlegraplnc ystem such as may be. used'in- "submarineqworksf Fig. 1 isa curve representing an alternat' current wavepf very long period, .or low uency, with shorter current waves,=fof higher frequency, such as.

occur in telephone .andtelegraph work superposed upon it;

In Fig. 1, M is an iron or steel ring composed, preferably, of thin, iron wires, on "which are woundzfa primary coil,' P, in

5 circuit with the line wires,--t, t, and the telepi'ione transmitter, T.;. a secondaryycoil,

' S, is: circuit with the line wires, 1', r,and

- the phone receiver, R; and the auxiliary coil,

core composed, preferably of thin iron wires, on which are woundr a primary coil, P,' in circuit with the line wires, t, t, and the tele- 4'5xnhone transmitter, T; a secondany coil, S,

" in circuit with the line wires, 1', r, and the telephone receiver, R'; and the auxiliary coil, Q, in circuit with the-source of alters, natin'g current, G;

In Fig. 3,,M is a core of iron or steel, but preferablycomposed. of thin iron wires, on which are,wound:a primary coil, P, in circuit with the' line wire, 70, and the telegraphic transmitting apparatus, K, the

circuitbein completed through the earth connections ligand E a secondary coil, S, in circuit with the line wire, 1, and the telegraphic receiving apparatus, L, the circg completed through the earth conand E and an-auxlllary coil, in circuit "with {a source of alternating current r.

in F A, :A', A,i?a'curv e representing ait-ernating-current wave of very long ,Fig. 3. reprosentsa relay or repeater in a" W];

. in circuit with the source of alter-'- 40 nating current, G. i.

In Fig. 2, M, is an iron or steel straight quency telephonic or. telegraphic currents, shown at a, 6 and-c.

in these vspecifications, are insulated from -the iron core, rom each other and between their ownturns.

In all the figures, the primary C011, P,

o ndary:coil, S,"wil'lact as a primary coil W en the direction of transmission is refore; theyhave been shown in the figures as designated forthe sake of clearness. .Also, for the sakeof clearness, the coils have been shown,- in the as occupying separate 1portions""o' flthe core, butthey may equal y well be wound over each other in layers, properly insulated from each other, and may be in t wo .or;morei .sections, properliy connected; V

' or transmitting in both directions, the number pf turns 'of the rimary and secondarygf coils are .pre erably equal.

' en continuous current 13 used in the auxiliaiycoih 'theflstrength of the current and cmhail... the core will beat or about its state of maximum permeability.

In and;

the exact constructions here indicated, but

What I here claim.as my invention and desire to secureby Letters Patent is:

1. In combination, ina relay or repeater, a plurality of coils in 'inductiverelation to each other, and an auxiliary coil through which is flowing a periodically varying current of approximately constant mean strength.

a plurality of coils in inductive relation to each other, and an auxiliary coil through which is flowing a uniformly varying current from an independent source.

3. In combination in a relay or' repeater, a plurality ofcoils in inductive relation to each other, and an auxiliary coilthrough which is flowing, from an independent sougce, an alternating current-ofa frequency below the limits of audibility.

4. A relay or repeater, .including an auxan iron core, a plurality of coils in inductive period onwhich are. superposed high-frerelationto each dtliiii mitonthe iron core,

proportioned,"magnetic field will be.

aujntensitysuch-that the iron of The/frequency of the auxiliary alternatin current shouldpreferabg be very low,

iliary coil through whichfiows a regularly I All of the .coils, P, S, and. Q, mentioned will act as-a secondary coil, and the. ,sec-

. it versed, and will act thus equally well as bei h mmber' eilt ni zq L eoil'sho l e s ow the. objects described in conven-- tional form, and I do not confine myself to 2. In combination in a relay or repeater, I

and an auxiliary coil through which flows a periodically varying current during the entire time of operation.

6. In combination in a relay or repeater, an iron core, a plurality of coils in inductive relation to each other, and an auxiliary coil through which is flowing an alternating current of a frequency below the limits of audibility from an independent source.

7. A relay or repeater including an iron core, an auxiliary coil through which is flowing a regularly varying current from an independent source, and coils in inductive relation to the auxiliary coil and the iron core.

This specification signed and witnessed this 18th day of February, A. D. 1903.

JOHN H. CUNTZ.

In the presence of ANTHONY N. JESBERA, LUCIUS' E. VARNEY. 

